Most of the hydrogen bomb's energy comes from
A) a chemical reaction.
B) magic.
C) fission.
D) fusion.
E) radioactive decay.
D
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A tuning fork with a frequency of 512 Hz is used to tune a violin. When played together, beats are heard with a frequency of 4 Hz. The string on the violin is tightened and when played again, the beats have a frequency of 2 Hz. The original frequency of the violin was
A. 510 Hz. B. 514 Hz. C. 516 Hz. D. 508 Hz.
Which of these did Pierre and Marie Curie discover about radioactivity?
a. Uranium is the only radioactive element. b. Several other elements are radioactive, some more so than uranium. c. The radiation from radioactive isotopes is a specific form of X rays. d. The radiation from radioactive isotopes includes positrons. e. The amount of radiation depends on the salt the uranium is combined with.
What is the most common depositional feature created by the work of the oceans?
What will be an ideal response?
What do peculiar velocities reveal?
A) the amount of dark matter in a galaxy B) the distribution of dark matter in large-scale structures C) the composition of dark matter D) the error in our observations of Hubble's law E) the critical density of the universe